Boiler.



F. s. BEAN, DEUD.. V. S. BEAU, ADM INiiflATEIX4 BOILBR.

APPLIOATIDN FILED JUNE 5, 1 906.

Patented Feb. 2, 1909.

2 SHEETS-SHEET 1.

I aN. n. c. TH: NaRRls PETER: cu.. WASI-Nar 11 s. BEAN, DBG'D. V. S. BEAN, DMINISTBATRIX. y

BOILER.

APPLIUATION FILED JUNE 5, 1906.

Patented Feb. 2,1909.

A TH: Nouns Pirtks ca, wAsHJNamN, o. c,

on sra'4 'VIOLA S. BEAN, OF MANCHESTER, NEW HAMPSHIRE, ADMINISTRATRIX OF FRED S. BEAN,

` DEGEASED.

BOILER.

Specification of Letters Patent.

Patented Feb. 2, 1909.

Application filed June 5, 1906. Serial No. 320,251.

To all whom it 'may concern:

Be it known that FRED S. BEAN, deceased, but late of Manchester, in the county of Hillsboro and State of New Hampshire, invented an Improvement in Boilers, of which the following description, in connection with the accompanying drawing, is a specification, like letters on the drawings representing like parts.

This linvention relates to boilers and particularly to upright boilers, such for instance as are used in re engines.

The object of the invention is to provide a novel construction by means of which the time taken to get up steam may be reduced without cutting down the water capacity of the boiler.

Boilers of the class to which this invention relate are usually constructed with an outer shell and with lues extending through the shell, the ends of the flues being secured to a plurality of sheets which constitute the ends of the water chamber. Usually there is considerable space between the lues and shell, this space often being sufficient so that the greater portion of thewater within the shell is in said space. In boilers of this construction the water which is immediately surrounding the flues is heated Iirst, and the time taken to heat the whole body of water and to get up steam depends upon the amount of water outside o'r' the lues between the latter and the shell. It has been proposed to reduce this amount of water which is not in touch with any heating surface by drawing in the shell at this point, but the eiiect of this construction is to materially reduce the capacity of the boiler.

It will be obvious, of course, that the boiler must contain the proper quantity of water, or there is a liability of the intense heat vaporizing all the heat in the boiler thus burning out the tubes.

W ith this invention the maximum amount of water capacity may be maintained, and yet the retarding e'ect of the comparatively large body of water outside of the ilues is avoided, this being done by placing within the shell a false shell or side which is spaced from the main shell and which forms with it an annular water chamber encircling the flues. In this way the water space of the shell is divided into two chambers, one

through which the flues pass, and the other an annular chamber outside of the iirst named chamber. This outside chamber separates the main body of water, which is not in contact with any lues, from the body oi water through which the iues pass, and forms a means for storing a reserve supply of water without causing this reserve supply to have any retarding eect upon the heating of the main body of water in the shell.

In the drawings, Figure 1 is a vertical section of an upright boiler embodying this invention; Fig. 2 is an upright section on the line x-x, and Figs. 3 4 and 5 are sectional views showing different ways in which the invention may be embodied.

Referring irst to Fig. 1, 3 designates the outer shell of the boiler, 4 the fire-box, 5 the 'liuc sheet which forms the top of the fire-box, 6 the iiues through which the products of combustion pass, 7 the flue sheet or head through which the upper ends of the flues pass and which forms the bottom of the smoke-chamber, 8 the exhaust opening from the smoke-chamber 9, and 10 a steam space.

The parts thus far described are such as are commonly found in boilers of this class and form no part of the present invention.

It will be noted that the lues 6 are comparatively close together, and consequently the water which surrounds the flues may be quickly heated. 'Ihere is, however, considerable space between the outer flues and the shell, and the water occupying this space does not come in direct contact with the iiues.

Where the shell of the boiler is made straight, as shown in the drawings, there is a large body of water in the annular space between the lues and the shell which can only be heated by circulating in toward the center of the boiler, and as this is a more or less slow process this body of water retards materially the time taken to get up steam. Accordingly in this im rovement is interposed between the shel 3 and the iiues a false shell 11, which forms with the shell 3 an annular chamber 12. In the form of the invention shown in Fig. 1 this false shell extends only from the lower flue sheet to the upper flue sheet, it being secured to the shell at top and bottom by any suitable means, as by rivets 13 and being bent inwardly to a 

